The conduct you describe is not based on bias against you for a protected classification (race, age, religion, etc.) nor for protected activity by you (filing a worker's comp claim, reporting unlawful discrimination, etc.) and for that reason this abusive conduct is not within the definition of unlawful employer conduct.
You may want to simply move to different employment.
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I agree that a discrimination claim would be hard to prove in your case. If this has caused you a great deal of stress which has manifested into a physical or mental injuries, a workers compensation claim may be the appropriate remedy.